Commodore 64 Supercharged by Omega2 (Pictures)

Way back in August last year I had an idea to "supercharge" my Commodore 64 with the Omega 2(+). This would require a second serial port, so the addition of ttyS1 on the Omega 2 worked out great for this.

Here's the breadboard circuit, using a 74HC245 for voltage level shifting (3.3V to 5V):

I've done something similar with a Raspberry Pi, but I much prefer the Omega2's form factor, looks like it would fit tidily in a retro cartridge case, for example.

Some minor issues though:

There isn't quite enough oomph from the C64's User Port to power the Omega2 directly (through a voltage converter) - max at 5V is officially 100 mA but it can usually be pushed safely to 200 mA with a good power supply though. Still not enough for the O2+ unfortunately.

It's a little awkward to get a login prompt over ttyS1 as well as at 2400 baud, as per this post. A login prompt isn't strictly necessary, you could have a python script running for example to handle whatever, but a real prompt is pretty cool.

Excuse me but this is simply not true.
BusyBox is modular and extremely configurable. On Omega you take advantage of these opportunities all the time when including or excluding applets / commands / features at compile time.
Due to the lack of information we don't have other possibilities than the trial and error method or digging the source code (if there is any).
A short Readme would be very useful (to show us what you've enabled / disabled).

In addition sometimes there is a pinch of false info (especially for newbies). For example: